الفهرس 
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Abstract
This study aims to assess the value of intraoperative IOUS in surgery of posterior fossa tumors in pediatric. Patients & methods: A prospective descriptive study was conducted in Mansoura University Hospitals, Department of Neurosurgery for 1 year. Our study included 30 child patients who underwent surgical excision of posterior fossa tumor using Intraoperative Ultrasound (IOUS). Results: In our study, we achieved total resection among studied cases in 22(73.33 %) cases, near-total resection was achieved in 3 (10 %) cases, subtotal resection was in 4 cases (13.3) and partial resection was in one case (3.33%). We could localize lesion well in 93.3% of studied cases and differentiate between cystic, solid and mixed lesions. In 70% of cases, we could reveal the margin well separated from normal tissue, 13.3% of studied cases were moderately defined and poorly-defined in 16.3%. 73.3% of cases demonstrated negative residual and 16.7% of the studied cases showed residual tumor on IOUS and postoperative MRI as a result of the tumor being located in an anatomically delicate area, while 3 cases (10%) of the patients showed no residual on IOUS and residual on postoperative MRI due to some limitation we faced to detect the residual. Artifacts from saline, blood clots and cottonoids in the resection cavity, all of these appeared hyperechoic on US as the most of solid part of tumor. Conclusions: Intraoperative ultrasound was found in our study to be of excellent value in resection of posterior fossa lesions with localization of the lesion, detection of lesion borders, character of the tumor, and differentiation of solid parts from cystic parts of the lesion. IOUS can be used in resection control of posterior fossa tumor as a cost-effective device especially in developing countries.